fix: address PR #831 review feedback

- Update DEFAULT_PRICING key from 'gc' to 'gemini-cli' so pricing
  lookups work with the new alias
- Restore gc -> gemini-cli in FALLBACK_ALIAS_TO_PROVIDER for backward
  compatibility (existing saved configs with gc/ prefix still resolve)

src/app/api/v1/models/catalog.ts

@@ -25,6 +25,7 @@ const FALLBACK_ALIAS_TO_PROVIDER = {
   cl: "cline",
   cu: "cursor",
   cx: "codex",
+  gc: "gemini-cli",
   gh: "github",
   if: "iflow",
   kc: "kilocode",

src/shared/constants/pricing.ts

@@ -189,8 +189,8 @@ export const DEFAULT_PRICING = {
     },
   },
 
-  // Gemini CLI (gc)
-  gc: {
+  // Gemini CLI
+  "gemini-cli": {
     "gemini-3-flash-preview": {
       input: 0.5,
       output: 3.0,